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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,603 records · Page 89
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DOE OSTI2013

Measurement of kT splitting scales in W->lv events at sqrt(s)=7 TeV with the ATLAS detector

CERN-LHC. A measurement of the splitting scales, as defined by the kT clustering algorithm, for final states containg a W boson produced in proton-proton collisions at a centre-of-mass energy 7 TeV. The measurements uses the full 2010 data sample with a total integrated luminsoity of 36 pb-1. The measurements are made separately for W bosons decaying into electron and muuon final states. Details of the splitting scale variable d_k are described in the paper. Data on the four hardest splitting scales d0,d1,d2 and d3 are presented together with their ratios.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Search for magnetic monopoles in s = 7 TeV p p collisions with the ATLAS detector

CERN-LHC. Search for magnetic monopoles in proton-proton collisions at a centre-of-mass energy of 7 TeV using data with a total integrated luminosity of 2.0 fb-1. Magnetic monopoles are characterized by large localized energy deposits in the LAr EM calorimeter (EMCLUSTER) in conjunction with a region of high ionization density in the transition radiation tracker, TRT. This record lists the efficiency for detection of such monopoles of two masses (200 and 1500 GeV) and the upper limits of the cross sections assuming production by Drell-Yan processes and in the fiducual region.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Measurement of Z boson Production in Pb+Pb Collisions at s N N = 2.76 TeV with the ATLAS Detector

CERN-LHC. Measurements of the PT and rapidity distributions of Z bosons produced in Lead-Lead collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV. The data sample has 1995 Z boson candidates from the 2011 heavy-ion run with a total integrated luminosity of 0.15 nb-1. The electron and muon decay channels of the Z boson are found to be consistent and combined results are presented. In addition to the rapidity and PT distributions in different centrality regions, the centrality (Npart) dependence of the Z boson yield divided by the mean number of collisions, Ncoll, is presented.

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DOE OSTI2012

Search for new phenomena in events with three charged leptons at / s q r t s = 7 TeV with the ATLAS detector

CERN-LHC. Measurement of the properties of events with 3 or more charged leptons produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample used has a total integrated luminosity of 4.6 fb-1 collected in 2011. The events are required to contain at least two electrons or muons, while the third lepton can be either an additional electron or muon, or a hadronically decaying tau lepton. Events are catagorized by the presence or absence of a reconstructed tau-lepton or a Z-boson candidate decaying into leptons. As well as the fiducial efficiencies the resuts are given as upper limits on event yields from non-SM processes producing at least 3 prompt, isolated leptons, given as functions of the lower bounds on several kinematic variables.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2013

Search for long-lived, multi-charged particles in pp collisions at s =7 TeV using the ATLAS detector

CERN-LHC. Measurements of the upper limits of cross sections for the production of highly ionising, penetrating particles with electric charges, |q|, from 2e to 6e in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data, collected during the 2011 running period, have an integrated luminosity of 4.4 fb-1. The observed upper limits are present together with the expected limits. Also shown are the rapidly falling cross sections from the Drell-Yan model.

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DOE OSTI2012

Search for light top squark pair production in final states with leptons and b − jets with the ATLAS detector in s = 7 TeV proton-proton collisions

CERN-LHC. Study of events from proton-proton interactions at a centre-of-mass energy of 7 TeV which have final states comprising exclusively one or two leptons (either electrons or muons), large missing transverse momentum, light flavour jets and b-jets. The data sample used has an integrated luminosity of 4.7 fb-1. The data are analysed in the framework of MSSM assuming the top squark decays exclusively to a chargino and b-quark. The data is divided into three signal regions, one (1LSR) requiring only one lepton with two light-quark jets and 2 b-jets, and two (2LSR1 and 2LSR2) requiring only two leptons and two leading jets with different requirements on the minimum energy and invariant mass of the specific subsystem from the hard-scattering process. The reader is refered to the text of the paper for more details.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2013

Search for heavy top-like quarks decaying to a Higgs boson and a top quark in the lepton plus jets final state in p p collisions at s = 8 TeV with the ATLAS detector

Study of events with final states consisting of a single isolated lepton + jets + missing transverse momentum produced in proton-proton collisions at a centre-of-mass energy of 8 TeV. The data sample has an integrated luminosity of 14.3 fb-1 collected during 2012. The leptons (electron or muon) are required to be isolated and have moderately high transverse momentum. The data is used in a search for a heavy up-type quark together with its antiparticle, assuming a significant branching ratio for subsequent decay into a SM Higgs boson and a top quark. The search exploits the high total transverse momentum of all final state objects and a high multiplicity of b jets. This record gives the HT distribution where HT is the scalar sum of the PT of the charged lepton, ET(missing) and the PT of the jets.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Measurement of angular correlations in Drell-Yan lepton pairs to probe Z/gamma* boson transverse momentum at sqrt(s)=7 TeV with the ATLAS detector

CERN-LHC. Measurements of the PHI* distributions of di-electron and di-muon Drell-Yan pairs produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample has an integrated luminosity of 4.6 fb-1. Normalised differential PHI* distributions are presented within the fiducial region of the leptons corrected to three levels, Born, dressed and bare, for QED FSR. The data are presented for di-electron and di-muons separately as well as combined, and also in three regions of rapidity as well as overall. For details of the variables see the text of the article. UPDATE (05 JAN 2015): corrected columns 2,3,4 of Tables 2,3,5,6 due to a bug fixed for bare and dressed cross sections in y-ranges; Table 4, value of the very last bin of the born dimuon, y>1.6, phi*=2.522-3.277 corrected (typo error).

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DOE OSTI2013

Search for third generation scalar leptoquarks in pp collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Study of events with final states consisting of one electron or muon with large PT, one high-PT hadronically decaying tau, missing ET from the tau decays, and two high-PT jets, produced in proton-proton collisions at a centre-of-lass enegy of 7 TeV. The data sample used has an integraterd luminosity of 4.7 fb-1 collected during 2011. The data are used to set limits on the production of pairs of 3rd generation leptoquarks which decay in a tau plus b-quark with an assumed branching ratio of 100% with only the specific lepton-hadron decay mode of the tau being sought after here. The limits are shown separately for the electron and muon decay modes of the tau and for the combined two modes combined.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Measurement of W + W − production in pp collisions at s =7 TeV with the ATLAS detector and limits on anomalous WWZ and WWγ couplings

CERN-LHC. Measurements of the cross section for W+W- production in proton proton collisions at a centre-of mass energy of 7 TeV. The data sample used, collected during 2011, has a total integrated luminosity of 4.6 fb-1 with 1325 candidate events in the double leptonic decay final state with electrons, muons and missing transverse momentum. The total cross section is presented together with fiducial cross sections in a phase space region, defined for each decay channel.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2013

Search for nonpointing photons in the diphoton and E T m i s s final state in s =7 TeV proton-proton collisions using the ATLAS detector

CERN-LHC. Study of events with a final state comprising two photons and missing transverse energy in proton-proton interactions at a centre-of-mass energy of 7 TeV using a data sample, collected in 2011, with an integrated luminosity of 4.8 fb-1. The analysis is focussed on a search for photons originating in the decay of neutral long-lived particles, exploiting the electromagnetic calorimeters ability to make measurements of the flight direction of the photons as well as excellent time resolution. Results are compared with Standard Model (SM ) expections as well as the predictions from GMSB models.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Measurement of Z Z production in p p collisions at s = 7 TeV and limits on anomalous Z Z Z and Z Z γ couplings with the ATLAS detector

CERN-LHC. Measurements of the cross section for ZZ production using the 4l and 2l2nu decay channels in proton-proton collisions at a centre-of-mass energy of 7 TeV with 4.6 fb^-1 of data collected in 2011. The final states used are 4 electrons, 4 muons, 2 electrons and 2 muons, 2 electrons and missing transverse momentum, and 2 muons and missing transverse momentum (MET).

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2013

Measurement of jet shapes in top-quark pair events at s = 7 TeV using the ATLAS detector

CERN-LHC. Measurement of the jet shapes in top-quark pair events from proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis uses a data sample of integrated luminosity 1.8 fb-1. Jets are reconstructed using the anti-kT algorithm with jet radius R=0.4. Jet shapes are presented as differential and integrated defined as: Differential (RHO) - scalar sum of jet PT in an annulus of thickness deltaR around radius r / scalar sum of jet PT in the cone of radius R. Integrated (PSI) - scalar sum of jet PT in cone radius r / scalar sum of jet PT in cone radius R. Data are shown separated into b-jets and light-jet events.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2011

Study of Jet Shapes in Inclusive Jet Production in p p Collisions at s = 7 TeV using the ATLAS Detector

CERN-LHC. Measurement of Jet Shapes in proton-proton collisions at centre-of-mass energy 7 TeV using 3 pb-1 of data. Reconstruction of the Jets uses the anti-kt algorithm in the PT range 30 to 600 GeV and rapidity from -2.8 to 2.8 with the distance parameter (in rapidity-phi space) R = 0.6. Measurements are presented of the differential jet shape, RHO, as a function of r, with RHO defined as the average fraction of the jet PT that lies inside an annulus of radius r and width Delta r around the jet axis. Measurements are also given for the integrated jet shape PSI defined as the average fraction of the jet PT that lies inside a cone of radius r concentric with the jet cone. The systematic errors, in order, are from (1) the cluster e-scale, (2) the shower model, (3) the jet e-scale, (4) the resolution, (5) the correction factor and (6) non-closure. See the text of the paper from more details. This record contains extra data tables not presented in the paper provided by the authors.

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